Riccardo Gallotti Armando Bazzani Sandro Rambaldi Understanding the variability of daily travel-time expenditures using GPS trajectory data. 18 2015 4 EPJ Data Sci. 1 https://doi.org/10.1140/epjds/s13688-015-0055-z https://www.wikidata.org/entity/Q59403452 db/journals/epjds/epjds4.html#GallottiBR15